Clicking child divs in GMap Cluster

I am trying to record clicks for two divs I have inside my gmap cluster. I have tried to register callbacks on the divs but for some reason I do not see the callback getting called. Here is the fiddle with an example http://jsfiddle.net/wodehpt0/6/.

const countWrapper = document.createElement('DIV');
  const countInDiv = document.createElement('DIV');
  const countOutDiv = document.createElement('DIV');

  countInDiv.innerHTML = countIn + ' <sup><small>IN</small></sup> ';
  countOutDiv.innerHTML = countOut + ' <sup><small>OUT</small></sup>';
  countInDiv.addEventListener('click', function (event) {
    console.log('clicked');
  });

I have registered the 'clusterclick' event, but am looking for two different behaviors based on which div inside the cluster was clicked.